单选题 The peripherals of the computer can be classified into two groups:( )
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单选题 The most useful pointing device is a ( ) ,which allows the user to point to elements on the screen.
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单选题 Users can type in texts and commands using the ( ),which is one of the most important input devices.
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单选题 ( ) is the control and data processing center of the whole computer system.
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单选题 When the computer is turned off, any information in ( ) will be lost.
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单选题 The characteristic of the LCD is ( ).
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单选题 A computer system consists of two main elements: ( )
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单选题 ( ) is the most popular Bus to be used on a motherboard.
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